18-3638 Outboard Thermostat for Mercury Mariner | JLM Marine family-mercury-850hp Remove the bolts securing the

Remove the bolts securing the housing using the appropriate socket

All components manufactured to OEM specifications for reliable fitment and durability

Q: What are the signs that my ignition coil needs replacement

Tighten the alternator mounting bolts securely while maintaining proper belt tension

18-3638 Outboard Thermostat for Mercury Mariner | JLM Marine family-mercury-850hp Remove the bolts securing theThermostat for Mercury Mariner Outboard Fits 2. 5 6 HP Models This high quality aftermarket thermostat is engineered to fit Mercury Mariner 2 stroke outboard engines ranging from 2. 5 HP to 6 HP. Designed as a direct replacement for OEM part numbers 804540 and 853704, it ensures reliable temperature regulation for your outboard motor. The kit includes both the thermostat and a rubber seal ring, providing everything needed for a complete installation.